CVE-2026-112908

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{"bugzilla": {"description": "filelock: filelock: unauthorized concurrent access via insecure claim directory permissions", "id": "2567955", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567955"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L", "status": "draft"}, "cwe": "CWE-279", "details": ["A flaw was found in filelock. When creating strict file locks on POSIX-compliant systems, coordination and claim directories are created without applying the caller's restrictive file permission settings. In environments with permissive file creation masks or default access control lists (ACLs), a local attacker can delete active lock claims or introduce invalid claim records into these directories. This can lead to unauthorized concurrent access to protected resources, potentially resulting in data corruption, or cause a denial of service (DoS) by preventing legitimate processes from acquiring locks."], "mitigation": {"lang": "en:us", "value": "Configure processes that employ filelock to run with a restrictive umask (such as 022 or 027) and store lock files in dedicated, user-owned directories rather than shared world-writable directories such as /tmp. Additionally, verify that parent directories do not enforce default POSIX ACLs that grant write permissions to other users or groups.\nTo apply a restrictive umask to an application process or session:\n```bash\numask 027\n```\nTo remove group and world write permissions on existing lock coordination trees:\n```bash\nfind /path/to/locks -maxdepth 2 -type d -name '*.filelock' -exec chmod -R go-w {} +\n```\nEnforcing restrictive umasks or removing write permissions will prevent legitimate cross-account lock sharing if an application intentionally relies on group-writable coordination files. Permission modifications should be executed while associated workloads are idle to avoid disrupting active synchronization."}, "name": "CVE-2026-112908", "package_state": [{"cpe": "cpe:/a:redhat:ansible_automation_orchestrator:2026.8", "fix_state": "Under investigation", "package_name": "ansible-automation-platform/automation-orchestrator-backend-rhel9", "product_name": "Ansible Automation Orchestrator 2026"}, {"cpe": "cpe:/a:redhat:exploit_intelligence:0", "fix_state": "Under investigation", "package_name": "exploit-intelligence/vulnerability-analysis-rhel9", "product_name": "Exploit Intelligence"}, {"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Under investigation", "package_name": "lightspeed-core/lightspeed-stack-rhel9", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Under investigation", "package_name": "lightspeed-core/rag-tool-cpu-rhel9", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": 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investigation", "package_name": "python-filelock", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Under investigation", "package_name": "devspaces/udi-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Under investigation", "package_name": "python3.12-filelock", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Under investigation", "package_name": "satellite/iop-advisor-backend-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Under investigation", "package_name": "satellite/iop-advisor-engine-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Under investigation", "package_name": "satellite/iop-host-inventory-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Under investigation", "package_name": "satellite/iop-insights-engine-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Under investigation", "package_name": "satellite/iop-puptoo-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Under investigation", "package_name": "satellite/iop-yuptoo-rhel9", "product_name": "Red Hat Satellite 6"}], "public_date": "2026-11-05T21:54:53Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-112908\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-112908\nhttps://github.com/tox-dev/filelock/commit/8cf51802158b9cf7e1fc560c2da30491a662cfde\nhttps://github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03\nhttps://github.com/tox-dev/filelock/pull/839\nhttps://github.com/tox-dev/filelock/releases/tag/4.2.1\nhttps://github.com/tox-dev/filelock/security/advisories/GHSA-6627-m3xw-93mp"], "statement": "This vulnerability is rated as Moderate impact because successful exploitation requires local unprivileged access alongside non-standard environmental configurations, such as an overly permissive umask or inherited default ACLs that grant write permissions to unauthorized users. On standard Red Hat Enterprise Linux deployments, the default system umask of 022 prevents arbitrary local users from deleting or modifying files within another user's lock directory. Consequently, unauthorized lock release, premature entry into critical sections, or denial-of-service conditions are restricted to shared multi-user setups with relaxed permission masks.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.30.0,4.2.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "filelock", "source": "cna", "vendor": "tox-dev"}, "product": "filelock", "vendor": "tox-dev"}], "created": "2026-11-05T23:45:07.426872+00:00", "updated": "2026-11-06T14:00:07.356758+00:00", "vendors": ["tox-dev", "tox-dev$PRODUCT$filelock"]}